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mathstoopidz

  • 3 years ago

2x+7y=-3 -9x+y=46

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  1. satellite73
    • 3 years ago
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    too many equal signs

  2. satellite73
    • 3 years ago
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    oh my fault i see \[2x+7y=-3\] \[-9x+y=46\] sorry

  3. satellite73
    • 3 years ago
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    you want elimination or substitution ?

  4. mathstoopidz
    • 3 years ago
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    Substitution

  5. satellite73
    • 3 years ago
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    then solve second equation for y, because it is easiest \[-9x+y=46\] \[y=9x+46\] and substitute into first equation

  6. Alexis1994_13
    • 3 years ago
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    2x+7y=-3 (*9) -----> 18x+63y=-27 -9x+y=46 (*2) -----> -18x+2y=92 <=> 65y=65 <=>y=1

  7. Alexis1994_13
    • 3 years ago
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    2x+7*1=-3 => 2x=-10 => x=-5

  8. Alexis1994_13
    • 3 years ago
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    You are welcome :p

  9. satellite73
    • 3 years ago
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    \[2x+7y=-3\] \[2x+7(9x+46)=-3\] \[65x+322=-3\] \[65x=-325\] \[x=-5\]

  10. satellite73
    • 3 years ago
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    the find y by substitution. Alexis got right answer using elimination. doesn't matter which you use

  11. Alexis1994_13
    • 3 years ago
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    We are both great ^^

  12. mathstoopidz
    • 3 years ago
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    Yes, You both are. I just wish I could understand this better... still confused :/

  13. mathstoopidz
    • 3 years ago
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    what would an ordered pair be?

  14. Alexis1994_13
    • 3 years ago
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    Just write what I am writing and if you still have any questions tell me.

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